Commitments and Contingencies (Intellectual Property Licenses) - Additional Information (Detail)
1 Months Ended 12 Months Ended
Jan. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
Amendments
Master License Agreement [Member] | UMB [Member]    
Other Commitments [Line Items]    
Annual maintenance fee   $ 10,000
Liabilities for milestone payments   $ 0
Number of amendments | Amendments   3
Percentage of non-royalty sub license income   10.00%
Master License Agreement [Member] | UMB [Member] | Minimum [Member]    
Other Commitments [Line Items]    
Annual royalty   $ 50,000
License Agreement [Member] | Johns Hopkins [Member]    
Other Commitments [Line Items]    
Percentage of non-royalty sub license income 20.00%  
Period to pay low percentage royalties after first commercial sale of licensed product 10 years  
Agreement termination notice period 90 days  
Upfront payment $ 75,000  
Potential milestone payments under license agreement 700,000  
Milestone payments expensed during period   50,000
Additional liabilities for milestone payments   0
License Agreement [Member] | Johns Hopkins [Member] | Minimum [Member]    
Other Commitments [Line Items]    
Annual royalty $ 30,000  
IND [Member] | Master License Agreement [Member] | UMB [Member]    
Other Commitments [Line Items]    
Milestone payment   50,000
NDA [Member] | Master License Agreement [Member] | UMB [Member]    
Other Commitments [Line Items]    
Milestone payment   $ 100,000